Feds this week announced that they have uncovered one of the largest drug-smuggling border tunnels ever.

The tunnel between San Diego and Tijuana measured roughly the length of eight football fields and was fitted with lighting, electricity and – get this – a friggin’ rail system (the better to move all that alleged contraband), according to a statement from the U.S. Attorney’s Office in San Diego.

The light at the end of this tunnel was green, prosecutors said: 10 tons of marijuana were found at the Tijuana end and “2 tons of marijuana and counting” were found at the San Diego end, according to the statement.

In fact, feds said, they were still “bringing bundles out of the tunnel” when they made the announcement yesterday. The marijuana is worth at least $6 million, U.S. Attorney’s officials said.

The raid was the culmination of a six-month investigation that brought feds to the Otay Center Warehouse at 2587 Otay Center Drive in San Diego’s Otay Mesa area, they said.

Twenty-two suspects with alleged ties to the operation were arrested on both sides of the border, prosecutors said.

Feds went undercover and were negotiating a deal with a suspect to move the cannabis from the warehouse just hours before the raid, they said. They believe it was the first time the sophisticated tunnel was used to move a big load of drugs.

“Federal agents on the San Diego Tunnel Task Force have once again taken down a sophisticated cross border drug smuggling tunnel that was fully operational under the San Diego-Tijuana border,” said Dave Shaw, special agent in charge for ICE Homeland Security Investigations in San Diego. “The success of this investigation is yet another example of our commitment to secure the border while combating the increasingly dangerous underground smuggling activity.”

Federal authorities say this was the tenth “large-scale” smuggling tunnel discovered in the San Diego border region in nearly a decade.

Luckily, up here in L.A., we like the local, indoor stuff. It’s better anyway.